Dau Tu Khoa Hoc Ky Thuat H&H Joint Stock Company Address: No 50, Lane 46, Hao Nam Street, O Cho Dua Ward, Dong Da District, Ha Noi City Enterprise code: 0104131448 Phone: 02435133552 Representative: Nguyen Thi Xuan Ha Adress: 8, B11 Thu Le 2, Ngoc Khanh Ward, Ba Dinh District, Ha Noi City O Cho Dua Ward, Dong Da District, Ha Noi CityFounding date: 27 - 8 - 2009